Improvement in dovetailing machines



ttitr tata @had (effin.

CRAWFORD STAPLES GEIEEIN AND .IOSIAII WELLS WILKINS, OE STOoK- TON, MAINE.

Letters Patent No. 109,123. dated November 8, 1870.

IMPROVEMENT IN DOVETAILING MACHlNES.

The Schedule referred co in these Letters Patniam making part of the same.

To all whom it mag/concern Be itknowu that we, CRAWFORD STAPLES GRIFFIN rfand JQSIAH WELLS IVILKINS, of Stockton, in the The nature of our, invention consists in the con-v struction and arrangement of a machine for cutting the tenons and grooves of dovetail joints; and it may be used as an attachment to II. B. Smiths tenoningmachine, patented January 23,1866, or as a separate device.

In order to enable Others skilled in the art to which our invention appertains'to make and use the same, we will now proceed to describe its construction and operation. v

A represents the hacleplate to which the shaftbearingT plate is attached.

-B is the shaft-bearing plate, which is placed on the back-plate A, and turns as on a'pivot between the concave and convex guides attached to the back-plate at each end, and lettered respectively l) and a. The

circular curvature of theseguides or lips is shown in iig. 1.

Each guide is provided with a flange, which cx- Moreteuds ovcr'the circular edge of the plate B, holding the same in place.

In the upper surface of the turn-plate B are dovetailed grooves, Z (l, in which are inserted slides, CIC', said slides being adj-usted by means of set-screws@ e, passing through slots in the same.

. -From the slides C C project standards, which support the boxes I) D, formingr bearings for the shaft E.

On iheendsof the shaft E is the saw G, and between thc boxes D D, on said shaft, is a pulley H, for driving the saw by means of a belt.

I is a lever, operating l on the turn-plate B, for straightening up the machine.

Dovetail grooves or tenons are easily cut, by this machine, Of any desired bevclor depth.

As constructed, `the machine is designed to be screwed on the rear side of the tenoninganachine, in place of an upper cope. The upper cope is seldom, it' ever used. Y l

It may be `nsed as an independent machine, by having suitable running-gear and trip mechanism attached thereto.'

Ulafim.

In combination, the base-plate Ar, turn-plate B, sawshaft E, adjustable slides C G,'circnlar guides a b, and adjusting-lever I, substantially as specified.

In testimony that we claim the above, we have hereunto subscribed our names in the presence of two witnesses.

CRAWFORD STAPLES GRIFFIN. J OSIAH WELLS IVILKINS. Witnesses:

ELIJAII TozIEu, ALBION I. Goonrron. 

